Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/Documentation/hwmon/sht3x.rst b/Documentation/hwmon/sht3x.rst
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+Kernel driver sht3x
+===================
+
+Supported chips:
+
+  * Sensirion SHT3x-DIS
+
+    Prefix: 'sht3x'
+
+    Addresses scanned: none
+
+    Datasheet: https://www.sensirion.com/file/datasheet_sht3x_digital
+
+Author:
+
+  - David Frey <david.frey@sensirion.com>
+  - Pascal Sachs <pascal.sachs@sensirion.com>
+
+Description
+-----------
+
+This driver implements support for the Sensirion SHT3x-DIS chip, a humidity
+and temperature sensor. Temperature is measured in degrees celsius, relative
+humidity is expressed as a percentage. In the sysfs interface, all values are
+scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
+
+The device communicates with the I2C protocol. Sensors can have the I2C
+addresses 0x44 or 0x45, depending on the wiring. See
+Documentation/i2c/instantiating-devices.rst for methods to instantiate the device.
+
+Even if sht3x sensor supports clock-strech(blocking mode) and non-strench
+(non-blocking mode) in single-shot mode, this driver only supports the latter.
+
+The sht3x sensor supports a single shot mode as well as 5 periodic measure
+modes, which can be controlled with the update_interval sysfs interface.
+The allowed update_interval in milliseconds are as follows:
+
+    ===== ======= ====================
+       0          single shot mode
+    2000   0.5 Hz periodic measurement
+    1000   1   Hz periodic measurement
+     500   2   Hz periodic measurement
+     250   4   Hz periodic measurement
+     100  10   Hz periodic measurement
+    ===== ======= ====================
+
+In the periodic measure mode, the sensor automatically triggers a measurement
+with the configured update interval on the chip. When a temperature or humidity
+reading exceeds the configured limits, the alert attribute is set to 1 and
+the alert pin on the sensor is set to high.
+When the temperature and humidity readings move back between the hysteresis
+values, the alert bit is set to 0 and the alert pin on the sensor is set to
+low.
+
+sysfs-Interface
+---------------
+
+=================== ============================================================
+temp1_input:        temperature input
+humidity1_input:    humidity input
+temp1_max:          temperature max value
+temp1_max_hyst:     temperature hysteresis value for max limit
+humidity1_max:      humidity max value
+humidity1_max_hyst: humidity hysteresis value for max limit
+temp1_min:          temperature min value
+temp1_min_hyst:     temperature hysteresis value for min limit
+humidity1_min:      humidity min value
+humidity1_min_hyst: humidity hysteresis value for min limit
+temp1_alarm:        alarm flag is set to 1 if the temperature is outside the
+		    configured limits. Alarm only works in periodic measure mode
+humidity1_alarm:    alarm flag is set to 1 if the humidity is outside the
+		    configured limits. Alarm only works in periodic measure mode
+heater_enable:      heater enable, heating element removes excess humidity from
+		    sensor:
+
+			- 0: turned off
+			- 1: turned on
+update_interval:    update interval, 0 for single shot, interval in msec
+		    for periodic measurement. If the interval is not supported
+		    by the sensor, the next faster interval is chosen
+repeatability:      write or read repeatability, higher repeatability means
+                    longer measurement duration, lower noise level and
+                    larger energy consumption:
+
+                        - 0: low repeatability
+                        - 1: medium repeatability
+                        - 2: high repeatability
+=================== ============================================================